Pneumatic lock



(No Model.)

A. W. FULLER.

PNEUMATIC LOOK.

INVENTOR WITNESSES ATTORNEYS.

N. PETERS. Plmln Lilhignlplmr. Wnshmglun. 111:.

ALONZO \V. FULLER, OF BOSTON, MASSACHUSETTS.

PNEUMATIC LOCK.

SPECIFICATION forming part of Letters Patent No. 299,066, dated May 20,1884:.

Application filed January 29, 1884.

To ctZZ whom it may concern.-

Be it known that I, ALoNZo W. FULLER, of Boston, in the county ofSuffolk and State of Massachusetts, have invented a new and ImprovedLook, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved lock forsafe and vault doors, in which look the bolts are thrown and drawn bymeans of compressed air.

The invention consists in a casing provided with two cylinders, eachcontaining a piston, which pistons move in opposite directions, and areconnected with a frame, to which the bolts are fastened. Anair-compressing device is provided in the casing, and by means of thecompressed air either piston can be operated, so that by means of theabove mechanism the bolts can be passed into apertures for receivingthem, or withdrawn from the same.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 is a longitudinal sectional elevation of my improved lock. Fig.2 is a diagram of the inner side of the safe-door on which the lock isheld.

The lock-casing A, which is provided with means for holding it on theinner surface of a safe-door, is provided with an air-compressingcylinder, B, in which a piston, 0, works, which is mounted on the innerend of a pistonrod, D, passing through a stuffing-box in the end of thecylinder B, and which piston-rod is connected by a connecting; rod, E,with a crank-arm, F, of a key-shaft, G, provided with a fixed orremovable key or handlefI-I.

At the top and bottom of the casing A the two cylinders J and J areformed, containing the pistons K K, provided with the piston-rods L L,projecting from the opposite (N'o model.)

posite ends with the ports h h,which can be closed by slide-valves O 0',having the ports kl. The sliding valves 0 O are connected with levers PP, pivoted on the ends of the casing. The cylinder J is provided in theworking end with a port, Z, which can be closed by a rocking valve, Q,provided with an arm, Q, connected by a connecting-rod, R, with thelever P. The cylinders J J are provided with the outlet-ports S S,atabout half their lengths from the working ends.

The top and bottom bolts on the safedoor can be operated from the frameM by means of angle or elbow levers.

The slide-valves O O can be replaced by rocking valves. 7

The operation is as follows: The door is closed and the valve 0 is soadjusted that the chamber N will be in communication with the cylinderJ. Then the piston O is operated by means of the key or handle H, or anyother suitable device to compress the air in the cylinder B, whichcompressed air passes into the chambers N N and acts on the piston K andpushes the same in the direction of the arrow a, and moves thebolt-frame M in the same direction, thereby passing the bolts 1 intotheir apertures in the safe-frame, thus locking the door in place. lVhenthe bolts are in their apertures, the piston K will have passed theaperture S, and the compressed air can escape from the cylinder. At thetime that the safe is to be opened, the lever l? is operated. by a keyor by the time-lock or other contrivance, and thereby the valve 0 ismoved in such a manner as to permit the compressed air to pass into thecylinder J and force the piston K in the inverse direction of the arrowa, thereby moving the frame M in the same direction and withdrawing thebolts from the apertures or the safe-frame, thus permitting the door tobe opened. In order that the piston K can move the frame M in theinverse direction of the arrow a, the compressed air must be removedfrom behind the piston K. As it may happen that the piston K does notpass the exhaust-port S, and the compressed air in the cylinder J wouldnot escape, I have arranged the outlet-port Z, the valve Q of which isopened from the lever F as soon as the lever B shifts the valve 0, thuspermitting the compressed air in the cylinder J to escape. If continuedpressure should be needed to hold the bolts in place after being thrownfor the purpose of locking, the outlet-aperture S in the cylinder Jcould be dispensed with, and the air would be permitted to escape fromthe cylinder J by means of the valve Q only.

Having thus described myinvention, I claim as new and desire to secureby Letters Patent 1. The combination, with a lock having two cylinderscontaining pistons connected at their opposite ends to the boltmechanism of the lock, of a third cylinder on said lock containing anair-compressing piston and connected with the other two cylinders bysuitable valve mechanism, to admit air alternately on opposite sides ofsaid pistons, substantially as herein shown and described.

2. The combination, with the casing A, having the cylinders B and J J,of the pistons G K K, the bolt-frame M, connected with the pistons K K,and of means for working the piston O in the cylinder B, substantiallyas herein shown and described.

3. The combination, with a casing, A, having cylinders B and J J, andthe chambers N N, of the valves 0 0, connecting said chambers withcylinders J J, and located in rear of the pistons O K K, a bolt-frameconnected with the pistons K K, at their opposite ends, and means foroperating the piston O in the cylinder B, substantially as herein shownand described.

4. The combination, with the casing A, having the cylinders B J J andthe compartments N N, of the pistons O K K, the valves 0 0, connectingchambers N N with cylinders J J, as shown, the levers P P, outside ofthe casing and connected to said valves, a boltframe connected with thepistons K K, as shown, and of means for operating the piston G in thecylinder B, substantially as herein shown and described.

5. The combination, with a lock-casing having two cylinders, eachcontaining a piston connected to the bolt mechanism of a lock, whichpistons work in opposite directions, of an aircompressor, openings foradmitting compressed air into the cylinders, and connected mechanism forpermitting the compressed air to escape from one cylinder at the sametime that the air is being admitted into the other cylinder,substantially as herein shown and described.

' ALONZO WM. FULLER.

Witnesses:

ANDREW BELL. ENooH E. 001mm.

